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| Main Authors: | , , , , |
|---|---|
| Format: | Artículo científico |
| Language: | en |
| Published: |
Zoological studies
2026
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| Online Access: | https://pubmed.ncbi.nlm.nih.gov/41959708/ |
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Table of Contents:
- Interaction Between Photoperiod and Gonadal Feedback on Expressions in Three-spined Stickleback, . Huang, Ching Wen Chang, Chia-Hao Liu, Tzu-Yen Borg, Bertil Shao, Yi Ta Cholecystokinin (CCK) is a peptide hormone that plays crucial roles not only in the digestive system but also in the central nervous system as a neurotransmitter. Recent research indicate that it is involved in the reproductive endocrine system, inducing the release of follicle-stimulating hormone (FSH) in medaka, . The present study tested whether expression is involved in the control of maturation in three-spined stickleback (). To that end, castrated and sham-operated males were exposed to short-day (8L:16D) or long-day (16L:8D) photoperiods for 3 or 30 days. Pituitary β was strongly elevated in castrated fish, particularly under short-day conditions, whereas β increased only in sham-operated fish after 30 days under long-day conditions. Castration increased hypothalamic a and b expression under short days, but decreased a after long-day exposure for 30 days. Photoperiod influenced whole-brain and hypothalamic s expression differently. Whole-brain s levels were generally higher under short days and lower under stimulatory long days, whereas these photoperiodic effects were largely absent in the hypothalamus. These findings suggest that hypothalamic genes may participate in feedback regulation on the BPG axis of the stickleback; however, FSH secretion and photoperiodic reproductive control likely involve additional factors.